"Was not glad" or "was unhappy" are possible antonyms for the phrase "wert glad." Alternatively, one could use "were sad," "felt dismal," "experienced gloom," or "had a heavy heart." Other antonyms might include "discontented," "dissatisfied," "morose," "depressed," "forlorn," "miserable," "bleak," "dreary," "gloomy," or "sorrowful." The choice of antonym depends on the specific context, tone, and mood of the sentence. Regardless of the chosen antonym, the opposite of being glad conveys a range of negative emotions that can range from mild disappointment to deep despair.